Schema:
Roles (role_code, role_description)
Users (user_id, role_code, user_name, user_login, password)
Document_Structures (document_structure_code, parent_document_structure_code, document_structure_description)
Functional_Areas (functional_area_code, parent_functional_area_code, functional_area_description)
Images (image_id, image_alt_text, image_name, image_url)
Documents (document_code, document_structure_code, document_type_code, access_count, document_name)
Document_Functional_Areas (document_code, functional_area_code)
Document_Sections (section_id, document_code, section_sequence, section_code, section_title)
Document_Sections_Images (section_id, image_id)
Please answer with SQL.